Diathesis: A hereditary or acquired susceptibility of the body to one or more diseases, an allergy, or another disorder.

MCS (Multiple chemical sensitivity): MCS is an acquired disorder characterized by persistent symptoms, referable to various organ systems, which occur in response to the exposure to many chemical compounds.

Chelation therapy: A medical procedure in which chelating agents are administered to the patient to remove heavy metals from the body.

Lyme disease: An infectious disease (Lyme borreliosis) caused by bacteria. A bulls-eye rash may become present about a week after a tick bite has occurred. The rash itself is not painful or itchy, and only about 50% of people will develop said rash. Symptoms for lyme disease vary from fever, to headache, to fatigue and joint/muscle pain, to name a few.